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Two kinds of oxygen vacancies in lithium titaniate doped with copper as detected by EPR
Solid State Sciences ( IF 3.5 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.solidstatesciences.2020.106337 Marcin Łapiński , Lidia Piekara-Sady , Robert Kozioł , Wojciech Sadowski , Barbara Kościelska
Solid State Sciences ( IF 3.5 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.solidstatesciences.2020.106337 Marcin Łapiński , Lidia Piekara-Sady , Robert Kozioł , Wojciech Sadowski , Barbara Kościelska
Abstract Lithium titanate (Li1+xTi2-xO4) doped with Cu2+ ions was synthesized by sol-gel processing method. The structure and morphology are characterized by X-ray Diffraction (XRD), X-ray Photoemission Spectroscopy (XPS), Scanning Electron Microscopy (SEM) and Electron Paramagnetic Resonance (EPR). Spin Hamiltonian parameters describing Zeeman and hyperfine interaction for 63Cu2+ ions were obtained from EPR spectra simulations. The spectra are characteristic for (Cu-VO)0 close-associate pairs consisting of copper replacing Ti4+ ion and an adjacent doubly ionized oxygen vacancy. These oxygen vacancies serve as charge compensators for the substituting copper ions. However, there are additional narrow EPR signals at g = 2.004 in all samples, including the sample of LiTi2O4 without dopant. These signals are ascribed to single-electron trapped oxygen vacancies VO●. Superconductivity was not confirmed down to 4.2 K by magnetic measurements in all samples studied.
中文翻译:
EPR检测铜掺杂钛酸锂中的两种氧空位
摘要 采用溶胶-凝胶法合成了掺杂Cu2+离子的钛酸锂(Li1+xTi2-xO4)。通过 X 射线衍射 (XRD)、X 射线光电发射光谱 (XPS)、扫描电子显微镜 (SEM) 和电子顺磁共振 (EPR) 表征结构和形态。描述 63Cu2+ 离子的塞曼和超精细相互作用的自旋哈密顿参数是从 EPR 光谱模拟中获得的。光谱是 (Cu-VO)0 紧密缔合对的特征,由铜取代 Ti4+ 离子和相邻的双电离氧空位组成。这些氧空位用作替代铜离子的电荷补偿剂。然而,在所有样品中,g = 2.004 处还有额外的窄 EPR 信号,包括不含掺杂剂的 LiTi2O4 样品。这些信号归因于单电子俘获氧空位VO●。在所有研究的样品中,磁性测量均未证实超导性低至 4.2 K。
更新日期:2020-08-01
中文翻译:
EPR检测铜掺杂钛酸锂中的两种氧空位
摘要 采用溶胶-凝胶法合成了掺杂Cu2+离子的钛酸锂(Li1+xTi2-xO4)。通过 X 射线衍射 (XRD)、X 射线光电发射光谱 (XPS)、扫描电子显微镜 (SEM) 和电子顺磁共振 (EPR) 表征结构和形态。描述 63Cu2+ 离子的塞曼和超精细相互作用的自旋哈密顿参数是从 EPR 光谱模拟中获得的。光谱是 (Cu-VO)0 紧密缔合对的特征,由铜取代 Ti4+ 离子和相邻的双电离氧空位组成。这些氧空位用作替代铜离子的电荷补偿剂。然而,在所有样品中,g = 2.004 处还有额外的窄 EPR 信号,包括不含掺杂剂的 LiTi2O4 样品。这些信号归因于单电子俘获氧空位VO●。在所有研究的样品中,磁性测量均未证实超导性低至 4.2 K。